JP2017093106A - Power management device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To utilize electrical power generated in an output control period effectively without waste.SOLUTION: A power management device includes a management section. The management section manages first and second power controllers capable of performing an interconnection operation with a power system, on the basis of output control information. The first power controller is connected between a current path connected with the power system and a first power generator and a power storage device. The second power controller is connected between a current path and a second power generator. An output control period for suppressing the output power, outputted from the first and second power controllers to the current path, is set in the output control information. In the output control period, the management section manages to suppress the first power, outputted from the first power controller to the current path, preferentially to the second power, outputted from the second power controller to the current path.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a power management apparatus.

  In recent years, power generation systems using natural energy, such as solar power generation systems, are being introduced into homes for general households or industrial facilities. In these power generation systems, the generated power is used as a power source for electronic devices and the like. At present, an electric power purchase system for selling generated electric power and purchasing it by an electric power company has been established in order to make the electric power generation system using natural energy more popular. Therefore, the generated power may flow backward to the commercial power system. The power generation system may be provided with a power storage device that stores the generated power. This power storage device can be used, for example, as a standby power source when a power failure occurs at night when solar power generation is not possible, or as an auxiliary power source when the power consumption of the power load temporarily protrudes and becomes large. In addition, with the widespread use of power generation systems, the number of cases where a new power generation device is added to a power generation system including a power storage device is increasing. In this case, the newly added power generation apparatus and its PCS (power conditioner) are connected to the current path between the existing PCS and the commercial power system.

  By the way, the increase in power generation systems in recent years has had a great influence on the supply and demand balance of the power system. For example, when solar power generation is actively performed by a plurality of solar power generation systems on a low power demand such as a large holiday, the power that is reversely flowed into the power system increases. For this reason, there is a surplus of power in the power system, and an adverse effect such as an increase in the voltage of an energization path connected to the power system may occur in the power system. In order to prevent such an adverse effect, an operator of the power system (for example, a power company) has the authority to instruct each power generation system to perform output control of power flowing backward to the power system. In this command, a period for performing output control of reverse flow power and an upper limit of reverse flow power in the period are designated. In the power generation system that has received this command, it is obliged to output-control the power output from the power generation system to the power grid during the output control period to be equal to or lower than the power allowed by the command.

  Here, when output control is commanded to a power generation system as described above in which a new power generator and PCS are added to the existing equipment, power output from the existing PCS according to the command during the output control period And the power output from the newly added PCS may be equally suppressed. In this case, the existing PCS can charge the power storage device with the output-controlled power of the generated power of the existing power generation device.

  As an example of conventional technology related to the present invention, Patent Document 1 teaches a power generation system including a solar cell and a power storage device. In this power generation system, when the system voltage rises due to the reverse power flow of excessive power to the power system, the reverse power flow is stopped and the power storage device is charged with the generated power.

Japanese Patent No. 5738212

  However, when the power output from each PCS is uniformly suppressed during the output control period, it is necessary to reduce the power generation amount of the generated power of the added power generation apparatus or to discard a part thereof. Therefore, the power that should have been generated by the additional power generation apparatus is wasted or the generated power cannot be used effectively. With respect to such a problem, Patent Document 1 does not assume a power generation system in which a power generation device and a PCS are newly added. That is, Patent Document 1 does not consider the above-described problems.

  The present invention has been made in view of such a situation, and an object thereof is to provide a power management apparatus that can effectively use generated power in an output control period without waste.

  In order to achieve the above object, a power management apparatus according to an aspect of the present invention includes a management unit that manages a first power control apparatus and a second power control apparatus that can be interconnected with a power system based on output control information. The first power control device is connected between the energization path connected to the power system, the first power generation device and the power storage device, and the second power control device is interposed between the energization path and the second power generation device. In the output control information, an output control period for controlling the output power output from the first power control device and the second power control device to the energization path is set. In the output control period, the management unit The first power output from the control device to the power supply path is configured to be suppressed with priority over the second power output from the second power control device to the power supply path.

  The power management apparatus configured as described above further includes a power monitoring unit that monitors power reception point power flowing through the power reception point based on a detection result of the power detector provided at the power reception point on the power supply path, and the power reception point in the output control period. When the power is not reversely flowing to the power system and the power consumption of the power load connected to the energization path is smaller than the upper limit of the output power allowed in the output control period, the management unit uses the first power. It is good also as a structure made to suppress with priority over 2nd electric power.

  The power management apparatus configured as described above further includes a calculation unit that calculates a first control value indicating an upper limit of the first power and an upper limit of the second power in the output control period, and includes output control information. In addition, an output control value indicating an upper limit in one output control period of the first power, the second power, and the output power is set, and the calculation unit sets the first control value and the second power based on the output control value. The control value may be calculated, and the management unit may manage power control of the first power control device and the second power control device in the output control period based on the result calculated by the calculation unit. In this configuration, the calculation unit may further calculate the first control value and the second control value based on the first rated power of the first power control device and the second rated power of the second power control device. . Alternatively, the calculation unit further includes the first control value and the second value based on at least one of the maximum value of the first generated power of the first power control device and the maximum value of the second generated power of the second power control device. A control value may be calculated.

  In the power management apparatus having the above configuration, the first control value may be set to be equal to or less than the second control value.

  In the power management apparatus having the above configuration, the receiving point power does not flow backward to the power system during the output control period, and the power consumption is smaller than the upper limit of the output power allowed in the output control period. In addition, the management unit may set the first control value to the same value as the output control value if the calculation unit can calculate the second control value at which the power reception point power is zero.

  In addition, the power management device having the above configuration is calculated when the receiving point power is not reversely flowing into the power system during the output control period and is smaller than the upper limit of the output power allowed in the output control period. If the second control value at which the receiving point power becomes 0 cannot be calculated by the unit, the second control value is set to the maximum value of the second control value, and the first control value at which the receiving point power becomes 0 It is good also as a structure which calculates.

  Moreover, in the power management apparatus having the above configuration, the power management apparatus may be provided integrally with one of the first power control apparatus and the second power control apparatus.

  According to the present invention, the generated power in the output control period can be effectively used without waste.

It is a block diagram which shows the structural example of a solar energy power generation system. It is a graph for demonstrating the electric power control of the photovoltaic power generation system accept | permitted in an output control period in a surplus purchase system. It is a flowchart for demonstrating an example of the power management process of a controller. It is a flowchart for demonstrating an example of the power control process of integrated PCS. It is a flowchart for demonstrating an example of the electric power control process of PCS for electric power generation. It is a schematic diagram for demonstrating the operation example of the surplus purchase control of a solar power generation system. It is a schematic diagram for demonstrating the other operation example of the surplus purchase control of a solar power generation system. It is a schematic diagram for demonstrating the further another operation example of the surplus purchase control of a solar power generation system. It is a graph which shows the example of a setting with time of a reverse conversion control value and a conversion control value. It is a block diagram which shows the other structural example of a solar power generation system. It is a block diagram which shows the structural example of a wind power generation system.

  Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment>
FIG. 1 is a block diagram illustrating a configuration example of the solar power generation system 100. The photovoltaic power generation system 100 is a distributed power source capable of grid-connected operation with the commercial power system CS, and includes a solar cell string PV and a power storage device S. The photovoltaic power generation system 100 is electrically connected to the commercial power system CS via, for example, a single-phase three-wire energization path P. In this solar power generation system 100, the generated power of the solar cell string PV is converted from direct current to alternating current, and power is transmitted from the solar power generation system 100 to the commercial power system CS via the current path P (that is, reverse power flow). The electric power can be sold to an electric power company or the like. It is also possible to receive power from the commercial power system CS to the power supply path P and purchase the power from an electric power company or the like. Hereinafter, the power that is reversely flowed (sold) into the commercial power system CS is referred to as reverse power flow, and the power that is supplied from the commercial power system CS to the energization path P is referred to as forward power.

  The energization path P includes a first energization path Pa, a second energization path Pb, and a third energization path Pc. The first energization path Pa is connected to an integrated power conditioner 1 described later of the photovoltaic power generation system 100, and the second energization path Pb is connected to a power generation power conditioner 2 described later. Hereinafter, the integrated power conditioner 1 is referred to as an integrated PCS (Power Conditioning System) 1, and the power generation power conditioner 2 is referred to as a power generation PCS 2. The third current path Pc is connected to the commercial power system CS. Moreover, the electric power load L is connected to the 3rd electricity supply path Pc. This power load L is a power load (equipment) such as household appliances and factory equipment, for example, and consumes power WL supplied from the third energization path Pc. Hereinafter, the power WL consumed by the power load L is referred to as power consumption WL.

  Next, the configuration of the solar power generation system 100 will be described. As shown in FIG. 1, the solar power generation system 100 includes a watt-hour meter M, a solar cell string PV, a power storage device S, an integrated PCS 1, a power generation PCS 2, and a controller 3.

  The watt-hour meter M is provided at a power receiving point (not shown) on the third energization path Pc between the commercial power system CS and the power load L. The watt-hour meter M is a power detector that detects the direction in which the power Wr flows at the power receiving point on the third energization path Pc, the power amount ([Wh]), and the power value ([W]). Is output to the controller 3. Hereinafter, the power Wr detected by the watt-hour meter M is referred to as a power receiving point power Wr. The watt-hour meter M indicates the power value of the receiving point power Wr flowing in the direction away from the commercial power grid CS as a positive value, and the power value of the receiving point power Wr flowing in the direction toward the commercial power grid CS is negative. Shown by value. In other words, the watt-hour meter M indicates the power value of the forward flow power as a positive value of the power receiving point power Wr, and indicates the power value of the reverse power flow as a negative value of the power receiving point power Wr.

  The solar cell string PV includes a first solar cell string PV1 and a second solar cell string PV2. Each solar cell string PV1 and PV2 is a power generator including one or a plurality of solar cell modules connected in series. The first solar cell string PV1 is connected to the integrated PCS1, and the second solar cell string PV2 is connected to the power generation PCS2. Each of the solar cell strings PV1 and PV2 receives sunlight to generate power, and outputs the generated DC power (generated power W1, W2) to the PCS 1 and 2. Note that the number of solar cell strings PV connected to each of the PCSs 1 and 2 is not limited to the example of FIG. 1 and may be plural.

  The power storage device S has a charge / discharge function capable of repeated charge / discharge. For example, the power storage device S can charge the DC power WS supplied from the integrated PCS1, and can discharge the DC power corresponding to the amount of storage to the integrated PCS1. Hereinafter, the electric power WS supplied and charged from the integrated PCS 1 to the power storage device S during charging is referred to as charging power WS, and the electric power output from the electric storage device S to the integrated PCS 1 during discharging is referred to as discharge power. Call. In addition, the structure of the electrical storage apparatus S is not specifically limited. For example, the power storage device S may include secondary batteries such as a lithium secondary battery, a nickel hydride battery, a nickel cadmium battery, and a lead battery. Alternatively, the power storage device S may include an electric double layer capacitor. Further, the number of power storage devices S is not limited to the example illustrated in FIG. 1 and may be plural.

  Next, the integrated PCS1 is a power control device that can be connected to an energy storage device such as the power storage device S in addition to the power generation device such as the first solar cell string PV1. The integrated PCS 1 is connected to the energization path P (first energization path Pa), the first solar cell string PV 1, and the power storage device S, and is connected to the commercial power system CS via the energization path P. The integrated PCS1 controls the power generation of the first solar cell string PV1, and normally, for example, by the MPPT (Maximum Power Point Tracking) control, the first solar cell string PV1 has the maximum generated power W1 so as to be maximized. The operating voltage (operating point) of the battery string PV1 is controlled. However, when it is necessary to limit the power generation of the first solar cell string PV1, the integrated PCS1 sets the operating voltage of the first solar cell string PV1 to a value that deviates from the maximum output operating voltage, and the generated power W1. Adjust. Moreover, the integrated PCS1 converts, for example, at least a part of the generated power W1 of the first solar cell string PV1 and outputs the converted power to the first current path Pa. In addition, the integrated PCS 1 also functions as a storage / discharge control device for the power storage device S. For example, the integrated PCS1 supplies at least a part of the generated power W1 to the power storage device S as charging power WS, or converts the power Wa flowing through the first current path Pa into power storage device S as charging power WS. Or is supplied with discharge power from the power storage device S.

  This integrated PCS 1 includes a DC / DC converter 11, a bidirectional inverter 12, a smoothing capacitor 13, a bidirectional DC / DC converter 14, a communication unit 15, a memory 16, and an IC 17. . Further, the DC / DC converter 11, the bidirectional inverter 12, and the bidirectional DC / DC converter 14 are connected to each other via a bus line BL.

  The DC / DC converter 11 is a direct current conversion unit connected to the first solar cell string PV1. The DC / DC converter 11 is provided between the first solar cell string PV1 and the bus line BL, converts the generated power W1 of the first solar cell string PV1 into DC power having a predetermined voltage value, and outputs it to the bus line BL. . Further, the DC / DC converter 11 prevents a reverse current from flowing through the first solar cell string PV1.

  The bidirectional inverter 12 is a bidirectional power converter controlled by the IC 17 and is provided between the bus line BL and the first energization path Pa. The bidirectional inverter 12 can perform bidirectional a and b power conversion as shown in FIG. 1 by PWM (Pulse Width Modulation) control or PAM (Pulse Amplitude Modulation) control. For example, the bidirectional inverter 12 can AC / DC convert AC power Wa input from the first current path Pa into DC power and output it to the bus line BL. Further, the bidirectional inverter 32 converts the DC power (at least one of the generated power W1 and the discharged power of the power storage device S) input from the bus line BL into AC according to the power standards of the commercial power system CS and the power load L. It can be DC / AC converted into AC power Wb having a frequency and output to the first current path Pa.

  In the following description, the bidirectional inverter 12 performing power conversion on the power Wa input from the first current path Pa and outputting it to the bus line BL is referred to as power conversion in the forward conversion direction a. Further, power conversion in the forward conversion direction a is referred to as forward conversion, and forward-converted power Wa is referred to as forward-converted power Wa. The bidirectional inverter 12 converting the electric power input from the bus line BL and outputting the electric power to the first energization path Pa is called power conversion in the reverse conversion direction b. Moreover, the power conversion in the reverse conversion direction b is called reverse conversion, and the reversely converted power Wb is called reverse conversion power Wb.

  Here, the upper limit value of the reverse conversion power Wb that is allowed to be output from the integrated PCS 1 is limited by the power control management of the controller 3. Hereinafter, this upper limit value is referred to as an inverse conversion upper limit value. The reverse conversion upper limit value is represented by {(Xb / 100) × E1} using the reverse conversion control value Xb [%] as described later. This reverse conversion upper limit value is normally set to the same value as the rated power E1 (ie, Xb = 100 [%]) of the integrated PCS1 (for example, other than the output control period). The rated power E1 is a rated value E1 that is set to the upper limit of the output power of the integrated PCS1 that is guaranteed at the time of design (that is, the reverse conversion power Wb). Further, the reverse conversion upper limit value is 0 or more and E1 or less by the power control management of the controller 3 during the output control period designated by the operator, for example, when output control of reverse power flow is instructed by the operator of the commercial power system CS. Is set to the value of

  The smoothing capacitor 13 is connected to the bus line BL, and removes or reduces fluctuations in the bus voltage value of the power flowing through the bus line BL.

  The bidirectional DC / DC converter 14 is a charge / discharge power conversion unit controlled by the IC 17 and is provided between the bus line BL and the power storage device S. The bidirectional DC / DC converter 14 can DC / DC convert DC power input from the bus line BL into DC charging power WS suitable for the power standard of the power storage device S and output the DC power to the power storage device S. The bidirectional DC / DC converter 14 can also convert the discharge power of the power storage device S into DC power having a predetermined voltage value and output it to the bus line BL. In the following description, the bidirectional DC / DC converter 33 converts the power input from the bus line BL into power and outputs it to the power storage device S as power conversion in the charging direction A. Furthermore, power conversion in the charging direction A is referred to as charge conversion. In addition, the bidirectional DC / DC converter 14 converting the discharge power of the power storage device S and outputting it to the bus line BL is referred to as power conversion in the discharge direction B. Furthermore, power conversion in the discharge direction B is referred to as discharge conversion.

  The communication unit 15 is a communication interface that performs wireless communication or wired communication with the controller 3. For example, the communication unit 15 transmits the operation states (particularly, power conversion amount, power conversion direction, rated power E1, etc.) of the DC / DC converter 11, the bidirectional inverter 12, and the bidirectional DC / DC converter 14 to the controller 3. To do. Further, the communication unit 15 receives control information for managing power control of the integrated PCS 1 from the controller 3.

  The memory 16 is a non-volatile storage medium that holds stored information non-temporarily without supplying power. The memory 16 stores control information, programs, and the like used in each component (particularly, the IC 17) of the integrated PCS 1.

  The IC 17 is a control unit that controls each component of the integrated PCS 1 by using information and programs stored in the memory 16. For example, the IC 17 controls the DC / DC converter 11, the bidirectional inverter 12, and the bidirectional DC / DC converter 14 based on the control information output from the controller 3, and in particular controls their power conversion.

  Next, the power generation PCS 2 will be described. The power generation PCS2 is a power control device that controls the power generation of the second solar cell string PV2. The power generation PCS2 is connected to the energization path P (second energization path Pb) and the second solar cell string PV2, and is connected to the commercial power system CS via the energization path P. For example, the power generation PCS2 converts the generated power W2 of the second solar cell string PV2 into power and outputs it to the second energization path Pb. In addition, during normal times, the power generation PCS 2 controls the operating voltage (operating point) of the second solar cell string PV2 so that the generated power W2 of the second solar cell string PV2 is maximized, for example, by MPPT control. However, when it is necessary to limit the power generation of the second solar cell string PV2, the power generation PCS2 sets the operating voltage of the second solar cell string PV2 to a value that deviates from the maximum output operating voltage, and the generated power W2 Adjust.

  The power generation PCS 2 includes a DC / DC converter 21, an inverter 22, a communication unit 25, a memory 26, and an IC 27. The DC / DC converter 21 and the inverter 22 are connected to each other via a bus line (not shown).

  The DC / DC converter 21 is a direct current converter connected to the second solar cell string PV2, and is provided between the second solar cell string PV2 and the inverter 22. The DC / DC converter 21 converts the generated power W <b> 2 of the second solar cell string PV <b> 2 into DC power having a predetermined voltage value and outputs it to the inverter 22. Further, the DC / DC converter 21 prevents a reverse current from flowing through the second solar cell string PV2.

  The inverter 22 is a power converter controlled by the IC 27 and is provided between the bus line and the DC / DC converter 21. The inverter 22 converts the DC power output from the DC / DC converter 21 into AC power Wc having an AC frequency according to the power standards of the commercial power system CS and the power load L by PWM control or PAM control, and the like. It can output to the current path Pb.

  Hereinafter, the power Wc that the inverter 22 converts the DC power output from the DC / DC converter 21 and outputs the DC power to the second energization path Pb is referred to as converted power Wc. Here, the upper limit value of the converted power Wc is limited by the power control management of the controller 3. Hereinafter, this upper limit value is referred to as a conversion upper limit value, and is represented by {(Y / 100) × E2} using a conversion control value Y [%] as described later. This conversion upper limit value is normally set to the same value as the rated power E2 (that is, Y = 100 [%]) of the power generation PCS2 (for example, other than the output control period). The rated power E2 is a rated value E2 that is set to the upper limit of the output power (that is, the converted power Wc) of the power generation PCS 2 guaranteed at the time of design. Further, the conversion upper limit value is, for example, from 0 to E2 by the power control management of the controller 3 during the output control period designated by the operator when an output control of reverse power flow is instructed by the operator of the commercial power system CS. Set to a value.

  The communication unit 25 is a communication interface that performs wireless communication or wired communication with the controller 3. For example, the communication unit 25 transmits the operating states (particularly, the power conversion amount, the rated power E2 and the like) of the DC / DC converter 21 and the inverter 22 to the controller 3. Further, the communication unit 25 receives control information for managing the power control of the power generation PCS 2 from the controller 3.

  The memory 26 is a non-volatile storage medium that holds stored information non-temporarily without supplying power. The memory 26 stores control information, programs, and the like used in each component (particularly, the IC 27) of the power generation PCS 2.

  The IC 27 is a control unit that controls each component of the power generation PCS 2 by using information and programs stored in the memory 26. For example, the IC 27 controls the DC / DC converter 21 and the inverter 22 on the basis of the control information output from the controller 3, and particularly controls the power conversion thereof.

  Next, the controller 3 will be described. The controller 3 is a power management device that controls and manages the integrated PCS 1 and the power generation PCS 2 that can be interconnected with the commercial power system CS. As shown in FIG. 1, the controller 3 includes a display unit 31, an input unit 32, a communication unit 33, a communication I / F 34, a storage unit 35, and a CPU 36.

  The display unit 31 displays information on the photovoltaic power generation system 100 on a display (not shown).

  The input unit 32 receives a user input and outputs input information corresponding to the user input to the CPU 36. For example, an input control period, which will be described later, and an output control value α, which will be described later, are input to the input unit 32. In this case, the output control period and the output control value α are associated with each other, set in output control information described later, and stored in the storage unit 35.

  The communication unit 33 is a communication interface that performs wireless communication or wired communication with the integrated PCS 1 and the power generation PCS 2. For example, the communication unit 33 receives information related to power conversion of the integrated PCS 1 and the power generation PCS 2 and outputs the information to the CPU 36, and transmits control information output from the CPU 36 to the integrated PCS 1 and the power generation PCS 2. Moreover, the communication part 33 receives the information regarding the power conversion of integrated PCS1, the information regarding charging / discharging to the electrical storage apparatus S, the information regarding the power conversion of PCS2 for electric power generation, etc., for example.

  The communication I / F 34 is a communication interface connected to a network NT (for example, the Internet).

  The storage unit 35 is a storage medium that holds stored information non-temporarily without supplying power. The storage unit 35 stores various information and software programs used by each component (particularly the CPU 36) of the controller 3. Further, the storage unit 35 stores output control information acquired by an information acquisition unit 361 described later or created by user input. In this output control information, an output control period and an output control value α are set in association with each other. The output control period and the output control value α are specified by the operator or user of the commercial power system CS. The output control period is a period during which control is performed to suppress output power WT output from the solar power generation system 100 (for example, the first and second PCS 1 and 2) to the energization path P. Further, the output control value α indicates the upper limit (particularly, the upper limits of the reverse conversion power Wb and the conversion power Wc) of the output power WT allowed in the output control period. The output control value α is specified by the ratio α [%] (0 ≦ α ≦ 100) of the upper limit values of the powers Wb and Wc that are allowed to be output with respect to the rated powers E1 and E2 of the PCS 1 and 2.

  The CPU 36 controls each component of the controller 3 using control information and a program stored in the storage unit 35 that holds information non-temporarily. The CPU 36 includes an information acquisition unit 361, a power monitoring unit 362, a calculation unit 363, a timer 364, and a management unit 365 as functional components.

  The information acquisition unit 361 acquires various information (for example, output control information) from the network NT via the communication I / F 34. The output control information is, for example, notified to the photovoltaic power generation system 100 or disclosed to the network NT (or a server connected to the network NT).

  The power monitoring unit 362 monitors the power of the solar power generation system 100. The power monitoring unit 362 monitors the power flowing through the power receiving point on the third conduction path Pc between the commercial power system CS and the power load L based on the detection result of the watt-hour meter M provided in the third conduction path Pc. . For example, the power monitoring unit 362 detects the power receiving point power based on the detection result of the watt-hour meter M. In addition, the power monitoring unit 362 detects input / output power of each of the PCSs 1 and 2 (that is, forward conversion power Wa, reverse conversion power Wb, conversion power Wc) and charge / discharge power of the power storage device S. Furthermore, the power monitoring unit 362 detects the power consumption WL based on, for example, the power receiving point power Wr detected by the watt-hour meter M and the input / output powers Wa, Wb, Wc of the PCS 1 and 2 received by the communication unit 33. You can also. Or you may provide the other watt-hour meter (not shown) which detects the power consumption WL in the electricity supply path between the electric power load L and the 3rd electricity supply path Pc. In this case, the power monitoring unit 362 can detect the power consumption WL based on the detection result of the watt-hour meter. In addition, the power monitoring unit 362 can also detect the generated power W1 and W2 of the first and second solar cell strings PV1 and PV2 by the communication unit 33. Alternatively, the power monitoring unit 362 sends the inverse conversion control value Xb and the conversion control value Y notified from the controller 3 to the PCS 1 and 2, and the input / output power Wa, Wb, Wc of the PCS 1 and 2 received by the communication unit 33. Based on the above, the generated power W1, W2 of each solar cell string 1, 2 can also be detected.

  The calculation unit 363 calculates and determines various management parameters. For example, the calculation unit 363 calculates and determines the upper limit value of the output power WT allowed during the output control period based on the output control value α set in the output control information. Further, the calculation unit 363 calculates an inverse conversion control value Xb [%] and a conversion control value Y [%] based on the rated power E1 of the integrated PCS1, the rated power E2 of the power generation PCS2, and the output control value α. . The reverse conversion control value Xb is a first control value that indicates, by a ratio Xb, the ratio of the reverse conversion upper limit value of the reverse conversion power Wb that is allowed to be output from the integrated PCS1 to the rated power E1 of the integrated PCS1. The conversion control value Y is a second control value that indicates a ratio Y of the conversion upper limit value of the converted power Wc that can be output from the power generation PCS2 to the second energization path Pb with respect to the rated power E2 of the power generation PCS2. Note that the reverse conversion control value Xb [%] is normally set to be equal to or lower than the conversion control value Y in order to suppress the reverse conversion power Wb output from the integrated PCS 1 with priority over the conversion power Wc output from the power generation PCS 2. The

  The timer 364 is a timekeeping unit, which measures the current date and time (that is, the current date and time) or the elapsed time from a predetermined time point to the present time.

  The management unit 365 manages power control of the integrated PCS 1 and the power generation PCS 2. For example, the management unit 365 outputs control information to the integrated PCS 1 and manages control of the solar cell string PV 1 by the DC / DC converter 11 and power conversion of the bidirectional inverter 12 and the bidirectional DC / DC converter 14. Further, the management unit 365 outputs control information to the power generation PCS 2 and manages the control of the second solar cell string PV 2 in the DC / DC converter 21 and the power conversion of the DC / DC converter 21 and the inverter 22. In addition, the management unit 365, in the output control period set in the output control information, based on the output control information, the monitoring result of the power monitoring unit 362, the calculation / determination result of the calculating unit 363, and the like, The power control of the PCS 2 is managed. At this time, the management unit 365 preferentially suppresses the reverse conversion power Wb output from the integrated PCS 1 over the conversion power Wc output from the power generation PCS 2.

  Next, an example of power control of the photovoltaic power generation system 100 during the output control period in the surplus purchase system will be described. FIG. 2 is a graph for explaining the power control of the photovoltaic power generation system 100 that is allowed during the output control period in the surplus purchase system. The thick solid line in FIG. 2 indicates the allowable upper limit value WU of the output power WT that is actually allowed in the surplus purchase system. A one-dot chain line shows a change with time of the total generated power (W1 + W2) of the solar cell string PV. A broken line indicates a change with time of the power consumption WL of the power load L. In FIG. 2, the output control period is from 9:00 to 15:00, and the output control value α = 40% is specified in the output control information. The sum of the upper limit values of the total outputs of the PCSs 1 and 2 that are allowed based on the output control value α is α (E1 + E2) / 100. This is also the upper limit of the output power WT allowed based on the output control value α. The state where the output control value is 100 [%] indicates a state where there is no output control instruction.

  In the surplus purchase system, power sale is permitted in the area below the thick solid line in FIG. 2 (in other words, the area between the thick solid line and the horizontal axis). That is, when there is an output control instruction of the output control value α [%] (0 ≦ α <100), in the output control period, as a general rule, for example, from 9:00 to 10:00 in FIG. The upper limit values of the electric power Wb and Wc that are allowed to be output from the PCS 2 are limited to αE1 / 100 and αE2 / 100, respectively. That is, only power output equal to or less than α [%] of the rated power E1, E2 is permitted. However, when the power consumption WL exceeds the upper limit value α (E1 + E2) / 100 of the total output of each PCS 1 and 2 as from 10:00 to 15:00 in FIG. 2, the difference is as shown by the hatched portion in FIG. It is allowed to further output the corresponding power from each of the PCSs 1 and 2. That is, in this case, the allowable upper limit value WU of the actually allowed output power WT is the same value as the power consumption WL.

  It should be noted that, when the time-dependent changes in the allowable upper limit value WU, the power consumption WL, and the total generated power (W1 + W2) are seen, the total generated power (W1 + W2) is the power consumption at 9 to 10 in the output control period of FIG. It is larger than WL and the allowable upper limit value WU is also larger than the power consumption WL. That is, WL <WU = {α (E1 + E2) / 100} <(W1 + W2). Therefore, in this time zone, the photovoltaic power generation system 100 sells surplus power by flowing backward to the commercial power system CS, and the receiving point power is Wr ≦ 0.

  In addition, in the output control period from 10:00 to 14:30, the allowable upper limit value WU is set to the same value as the power consumption WL, and the total generated power (W1 + W2) is larger than the power consumption WL. That is, WU = WL <(W1 + W2). Therefore, in this time zone, the solar power generation system 100 can supply the same power as the power consumption WL to the power load L by adjusting the power Wb and Wc output from the PCS 1 and 2.

  In addition, in the output control period from 14:30 to 15:00, the allowable upper limit value WU is set to the same value as the power consumption WL, and the total generated power (W1 + W2) is smaller than the power consumption WL. That is, WU = WL> (W1 + W2). Therefore, in this time zone, the solar power generation system 100 cannot supply the same power as the power consumption WL to the power load L only with the total generated power (W1 + W2). That is, even if the PCS 1 and 2 output the conversion control values Xb and Y as 100% or output the same power Wb and Wc as the rated powers E1 and E2, the power consumption WL is insufficient. Therefore, the solar power generation system 100 purchases power by flowing the deficient power from the commercial power system CS forward.

  Next, the power management processing of the integrated PCS 1 and the power generation PCS 2 performed by the controller 3 in order to perform the power control as described above when the photovoltaic power generation system 100 receives an output control instruction will be described. FIG. 3 is a flowchart for explaining an example of the power management processing of the controller 3. The processing in FIG. 3 is started when, for example, the information control unit 361 acquires the output control information or the content of the output control instruction is input by the user to the input unit 32.

  The management unit 365 reads the output control information from the storage unit 35, and acquires the output control period schedule and the output control value α in each output control period set in the output control information (S101). The timer 364 acquires the current date and time (S102), and determines whether or not the latest output control period has been reached (S103).

  When it is not determined that the output control period has been reached (NO in S103), the management unit 365 sets both the reverse conversion control value Xb of the integrated PCS1 and the conversion control value Y of the power generation PCS2 to 100 [%] ( S104). At this time, the PCS 1 and 2 are not limited in output because there is no output control instruction. And a process progresses to S115 mentioned later.

  On the other hand, when it is determined that the output control period has been reached (YES in S103), the power monitoring unit 362 detects the power receiving point power Wr and the power consumption WL (S105), and the power monitoring unit 362 has the power receiving point power Wr of 0. It is determined whether it is larger than [W] (S106). When Wr> 0 is not satisfied (NO in S106), the management unit 365 sets both the reverse conversion control value Xb of the integrated PCS1 and the conversion control value Y of the power generation PCS2 to the output control value α [%] (S107). ). Accordingly, each of the PCSs 1 and 2 outputs powers Wb and Wc having upper limit values αE1 / 100 and αE2 / 100 or less in accordance with the output control value α. The surplus power {(Wb + Wc) −WL} (> 0) is sold to the commercial power system CS. Then, the process proceeds to S115.

  When Wr> 0 (YES in S106), the power monitoring unit 362 further determines whether or not the power consumption WL is larger than the sum (E1 + E2) of the rated powers of the integrated PCS1 and the power generation PCS2 (S108). . The total sum (E1 + E2) of the rated powers is an example of the upper limit value of the output power WT that is allowed based on the output control value α in the output control period. When WL> (E1 + E2) (YES in S108), the management unit 365 sets both the reverse conversion control value Xb of the integrated PCS1 and the conversion control value Y of the power generation PCS2 to 100 [%] (S109). . That is, the output of each PCS 1 and 2 is not controlled, but the insufficient power {WL− (Wb + Wc)} (> 0) is purchased from the commercial power system CS. Then, the process proceeds to S115.

  If WL> (E1 + E2) is not satisfied (NO in S108), the same power as the power consumption WL can be supplied to the power load L by adjusting the conversion control values Xb and Y of PCS1 and PCS2. In this case, the management unit 365 determines whether or not the power receiving point power Wr = 0 can be obtained by adjusting the conversion control value Y to a value within a range of 100 [%] or less (S110). For example, when the management unit 365 notifies the power generation PCS 2 of the conversion control value Y calculated based on each control value α, Xb, Y and the detection result of the power monitoring unit 362, the converted power Wc changes. It is determined whether or not the power receiving point power Wr can be reduced to 0 by a change in the converted power Wc.

  When receiving point power Wr = 0 can be set by adjusting conversion control value Y (YES in S110), management unit 365 sets conversion control value Y to a value that causes receiving point power Wr = 0 (S111). Then, the management unit 365 sets the inverse conversion control value Xb to the output control value α [%] (S112). Then, the process proceeds to S115.

  If the receiving power Wr = 0 cannot be set even after adjusting the conversion control value Y (NO in S110), the management unit 365 sets the conversion control value Y to 100 [%] (S113). Then, the calculation unit 365 calculates the value of the reverse conversion control value Xb where the power receiving point power Wr = 0 when the conversion control value Y = 100 [%], and the management unit 365 calculates the reverse conversion control value Xb. (S114). Then, the process proceeds to S115.

  Next, under the control of the management unit 365, the communication unit 33 notifies the integrated PCS1 of the reverse conversion control value Xb and notifies the power generation PCS2 of the conversion control value Y (S115). Then, the process returns to S101.

  Next, the power control process of the integrated PCS 1 that has received the notification of the inverse conversion control value Xb will be described. FIG. 4 is a flowchart for explaining an example of the power control process of the integrated PCS 1.

  First, when the communication unit 15 receives the reverse conversion control value Xb (S201), the IC 17 has a ratio {100 × (Wb) of the reverse conversion power Wb output to the first current path Pa with respect to the rated power E1 of the integrated PCS1. / E1)} exceeds the inverse conversion control value Xb (S202). When the ratio exceeds the reverse conversion control value Xb (YES in S202), the reverse conversion power Wb is reduced by reducing the reverse conversion amount in the bidirectional inverter 12 (S203). And a process progresses to S206 mentioned later.

  On the other hand, if the ratio does not exceed the reverse conversion control value Xb (NO in S202), it is determined whether the ratio {100 × (Wb / E1)} is less than the reverse conversion control value Xb (S204). If the ratio is not less than the inverse conversion control value Xb (NO in S204), the process proceeds to S206. When the ratio is less than the reverse conversion control value Xb (YES in S204), the reverse conversion power Wb is increased by increasing the reverse conversion amount in the bidirectional inverter 12 (S205). Then, the process proceeds to S206.

  Next, for example, when the reverse conversion power Wb decreases in S203, surplus power may be generated in the generated power W1. When there is surplus power, the bus voltage value of the bus line BL increases. Therefore, if the bus voltage value of the bus line BL is equal to or greater than the threshold (YES in S206), it is determined that surplus power is generated, and the bidirectional DC / DC converter 14 performs charge conversion (S207). With this process, the power storage device S performs charging, and the process returns to S201.

  On the other hand, if the bus voltage value of the bus line BL is less than the threshold value (NO in S206), it is determined that no surplus power is generated, and the bidirectional DC / DC converter 14 performs discharge conversion (S208). With this process, the power storage device S performs discharging, and the process returns to S201.

  Next, the power control process of the power generation PCS 2 that has received the notification of the conversion control value Y will be described. FIG. 5 is a flowchart for explaining an example of the power control process of the power generation PCS 2. First, when the communication unit 25 receives the conversion control value Y (S301), the IC 27 outputs a ratio {100 × (Wc / E2) of the converted power Wc output to the first current path Pa with respect to the rated power E2 of the power generation PCS2. )} Exceeds the conversion control value Y (S302). When the ratio exceeds the conversion control value Y (YES in S302), the conversion power Wc is reduced by reducing the power conversion amount in the inverter 22 (S303). Then, the process returns to S301.

  On the other hand, when the ratio does not exceed the conversion control value Y (NO in S302), it is determined whether the ratio {100 × (Wc / E2)} is less than the conversion control value Y (S304). If the ratio is not less than the conversion control value Y (YES in S304), the process returns to S301. When the ratio is less than the conversion control value Y (YES in S304), the conversion power Wc is increased by increasing the power conversion amount in the inverter 22 (S305). Then, the process returns to S301.

  Next, the power control of the photovoltaic power generation system 100 during the output control period in the surplus purchase system will be described in more detail with an operation example.

  FIG. 6 is a schematic diagram for explaining an operation example of surplus purchase control of the photovoltaic power generation system 100. FIG. 6 shows an example of control before and after reaching the output control period. The output control value α indicated by the output control instruction commanded by the operator of the commercial power system CS is set to 0 [%]. The generated power W1 of the first solar cell string PV1 when MPPT control is 4 [kW]. The generated power W2 of the second solar cell string PV2 is 4 [kW]. The power consumption WL of the power load L is 2 [kW]. Furthermore, the rated power E1 of the integrated PCS1 and the rated power E2 of the power generation PCS2 are both 4 [kW].

  Before reaching the output control period, the integrated PCS 1 is notified of the inverse conversion control value Xb = 100 [%], and the power generation PCS 2 is notified of the conversion control value Y = 100 [%]. Therefore, the reverse conversion upper limit {(Xb / 100) × E1} of the integrated PCS1 is set to 4 [kW], and the conversion upper limit {(Y / 100) × E2} of the power generation PCS2 is set to 4 [kW]. Is set. Therefore, the reverse conversion power Wb = 4 [kW] can be output from the integrated PCS1, and the conversion power Wc = 4 [kW] can be output from the power generation PCS2. Therefore, output power WT = 8 [kW] can be output to the third energization path Pc. In this state, a part of the output power WT is consumed by the power load L, but the output power WT is larger than the power consumption WL = 2 [kW] of the power load L. Therefore, the receiving point power is Wr = −6 [kW], and the reverse power flow of 6 [kW] is sold to the commercial power system CS.

  In the output control period, the output power WT is limited based on the output control instruction. Here, the photovoltaic power generation system 100 sells power, and the output control value α = 0 [%] is commanded in the output control instruction. Therefore, the integrated PCS 1 is notified of the inverse conversion control value Xb = 0 [%], and the power generation PCS 2 is notified of the conversion control value Y = 0 [%]. Accordingly, once Wb = Wc = WT = 0, 2 [kW] forward power supplied to the power consumption WL is purchased from the commercial power system CS. The integrated PCS 1 charges the power storage device S with all the generated power W1 = 4 [kW] of the first solar cell string PV1.

  Here, in the surplus purchase system (see FIG. 2), when the power consumption WL exceeds the upper limit of the output power WT based on the output control value α, the output of the output power WT having a value corresponding to the difference is allowed. . Therefore, the controller 3 notifies the power generation PCS 2 of the conversion control value Y = 50 [%] in order to set the power receiving point power Wr = 0. Therefore, the power generation PCS2 adjusts the operating voltage of the second solar cell string PV2 to set the generated power W2 to 2 [kW] and outputs the converted power Wc = 2 [kW]. In addition, since the receiving point power Wr = 0 can be set by adjusting the conversion control value Y, the reverse conversion control value Xb is not changed. Therefore, the reverse conversion power Wb remains 0 [kW]. Then, the output power WT (= 2 [kW]) is output to the third conduction path Pc and consumed by the power load L. Accordingly, the power receiving point power Wr = 0.

  Next, an operation when the power consumption WL increases (2 [kW] → 5 [kW]) during the output control period in the above-described operation example (see FIG. 6) will be described. FIG. 7 is a schematic diagram for explaining another operation example of the surplus purchase control of the photovoltaic power generation system 100.

  As shown in FIG. 7, when the power consumption WL increases, the output power WT = 2 [kW] becomes smaller than the power consumption WL = 5 [kW]. For this reason, the photovoltaic power generation system 100 purchases the insufficient power, and the power receiving point power Wr = 3 [kW]. In this state, even if the conversion control value Y of the power generation PCS 2 is adjusted to 100 [%], the power receiving point power Wr cannot be reduced to 0 [kW], so it is necessary to increase the reverse conversion power Wb of the integrated PCS 1. is there. As described above, in the surplus purchase system (see FIG. 2), when the power consumption WL exceeds the upper limit of the output power WT based on the output control value α, the output of the output power WT having a value corresponding to the difference is output. Is allowed.

  Therefore, the controller 3 notifies the power generation PCS 2 of the conversion control value Y = 100 [%], and in the case of the conversion control value Y = 100 [%], the reverse conversion control value Xb = 25 that can make the receiving point power Wr = 0. [%] Is notified to the integrated PCS 1. Therefore, the integrated PCS 1 outputs the reverse conversion power Wb = 1 [kW]. The charging power WS supplied to the power storage device S is reduced to 3 [kW]. Further, the power generation PCS 2 outputs converted power Wc = 4 [kW]. The output power WT increases to 5 [kW] and is consumed by the power load L. Accordingly, the power receiving point power Wr = 0.

  Next, an operation when the generated power W2 of the second solar cell string PV2 is reduced (2 [kW] → 0.5 [kW]) during the output control period in the operation example of FIG. 6 will be described. FIG. 8 is a schematic diagram for explaining still another operation example of surplus purchase control of the solar power generation system 100.

  As shown in FIG. 8, if only the generated power W2 of 0.5 [kW] can be generated even if the second solar cell string PV2 is MPPT-controlled during the output control period, the converted power Wc and the output power WT are 0.5 [ kW], and the output power WT becomes smaller than the power consumption WL = 2 [kW]. For this reason, the photovoltaic power generation system 100 purchases the insufficient amount of power, and the power receiving point power Wr = 1.5 [kW]. In this state, even if the conversion control value Y of the power generation PCS 2 is adjusted to 100 [%], the converted power Wc and the output power WT remain 0.5 [kW] and do not increase. Therefore, in order to set the power receiving point power Wr = 0 [kW], it is necessary to increase the reverse conversion power Wb of the integrated PCS1. As described above, in the surplus purchase system (see FIG. 2), when the power consumption WL exceeds the upper limit of the output power WT based on the output control value α, the output of the output power WT having a value corresponding to the difference is output. Is allowed.

  Therefore, the controller 3 notifies the integrated PCS1 of the inverse conversion control value Xb = 37.5 [%] and sets the conversion control value Y = 100 [%] to the power generation PCS2 in order to set the receiving point power Wr = 0. To be notified. Therefore, the integrated PCS 1 outputs reverse conversion power Wb = 1.5 [kW]. The charging power WS supplied to the power storage device S is reduced to 2.5 [kW]. Further, the converted power Wc output by the power generation PCS 2 remains 0.5 [kW]. Then, the output power WT (= 2 [kW]) is output to the third conduction path Pc and consumed by the power load L. Accordingly, the power receiving point power Wr = 0.

  Next, an example of the temporal change of the inverse conversion control value Xb and the conversion control value Y will be described. FIG. 9 is a graph showing an example of setting the inverse conversion control value Xb and the conversion control value Y over time. In FIG. 9, the total generated power (W1 + W2) of the solar cell string PV is not shown for easy understanding of the setting example. In FIG. 9, at time t1, an output control period based on an output control instruction indicating an output control value α (for example, 25 [%]) is started. The conditions other than the output control value α and the power consumption WL are the same as those in FIG. Further, the reverse conversion power Wb is output up to the same value as the reverse conversion upper limit value {(Xb / 100) × E1}, and the conversion power Wc is output up to the same value as the conversion upper limit value {(Y / 100) × E2}. Shall.

  Further, in FIG. 9, a solid line G1 is a graph showing a change with time of the reverse conversion upper limit value (that is, the upper limit of the reverse conversion power Wb). A solid line G2 is a graph showing a change with time of the conversion upper limit value (that is, the upper limit of the conversion power Wc). A region A1 indicates the amount of power of the upper limit value α (E1 + E2) / 100 of the output power WT allowed by the output control instruction. Region A2 indicates the amount of power supplemented by the converted power Wc output from the power generation PCS2 when the power consumption WL exceeds the upper limit value α (E1 + E2) / 100 of the output power WT corresponding to the output control value α. . The area A3 is the reverse conversion power Wb output from the integrated PCS1 when the power consumption WL exceeds the upper limit value of the output power WT corresponding to the output control value α and the conversion control value Y reaches 100 [%]. Indicates the amount of power supplemented by.

  In the time zone T1 before time t1, as shown in FIG. 9, since the output control period has not been reached, the outputs of the integrated PCS1 and the power generation PCS2 are not limited. Therefore, both the inverse conversion control value Xb and the conversion control value Y are set to 100 [%]. Therefore, the inverse conversion upper limit {(Xb / 100) × E1} of the integrated PCS1 and the conversion upper limit {(Y / 100) × E2} of the power generation PCS2 are set to 4 [kW]. The allowable upper limit value WU of the output power WT that is actually allowed is set to 8 [kW].

  At time t1, the output control period is reached, and in time zone T2, power consumption WL is lower than upper limit value α (E1 + E2) / 100 of output power WT based on output control value α. Therefore, in this time zone T2, the outputs of the integrated PCS1 and the power generation PCS2 are limited, and the inverse conversion control value Xb and the conversion control value Y are both set to 25 [%] according to the output control value α. Therefore, both the reverse conversion upper limit value of the integrated PCS1 and the conversion upper limit value of the power generation PCS2 are set to 1 [kW], and the allowable upper limit value WU of the actually allowed output power WT is set to 2 [kW]. . In FIG. 9, in order to make the contents easy to understand, the outputs of the integrated PCS 1 and the power generation PCS 2 are shown to change instantaneously.

  After time t2, the power consumption WL becomes larger than the upper limit value of the output power WT based on the output control value α. Further, in order to prioritize the output of the converted power Wc over the reverse converted power Wb, the conversion control value Y is the difference between the power consumption WL and the upper limit value of the output power WT based on the output control value α [WL− {α (E1 + E2) / 100}]. Therefore, in the time zone T3, the conversion control value Y increases from 25 [%] to 100 [%]. Note that the inverse conversion control value Xb is maintained at 25%. Therefore, the reverse conversion upper limit value of the integrated PCS 1 is maintained at 1 [kW], the conversion upper limit value of the power generation PCS 2 increases from 1 [kW] to 4 [kW], and the allowable output power WT that is actually allowed is allowed. The upper limit value WU increases from 2 [kW] to 5 [kW].

  At time t3, the conversion control value Y reaches a maximum value of 100 [%], so that the reverse conversion control value Xb is increased according to the difference between the power consumption WL and the conversion power Wc of the power generation PCS2. Therefore, in the time zone T4, the inverse conversion control value Xb increases from 25 [%] to 100 [%]. The conversion control value Y is maintained at 100%. Therefore, the reverse conversion upper limit value of the integrated PCS 1 increases from 1 [kW] to 4 [kW], the conversion upper limit value of the power generation PCS 2 is maintained at 4 [kW], and the allowable output power WT that is actually allowed is allowed. The upper limit value WU increases from 5 [kW] to 8 [kW].

  At time t4, the inverse conversion control value Xb and the conversion control value Y both have a maximum value of 100 [%]. In the time zone T5, the power consumption WL exceeds the sum of the rated outputs of the PCS 1 and 2 (E1 + E2) = 8 [kW]. Therefore, in the time zone T5, the reverse conversion control value Xb and the conversion control value Y are both maintained at the maximum value 100 [%], and the reverse conversion upper limit value of the integrated PCS1 and the conversion upper limit value of the power generation PCS2 are 4 [kW]. Maintained at. Therefore, the allowable upper limit value WU of the output power WT that is actually allowed is maintained at 8 [kW], and the power corresponding to the difference between the power consumption WL and the sum of the rated outputs (E1 + E2) is obtained from the commercial power system CS. Purchased electricity.

  At time t5, the power consumption WL becomes lower than the sum of the rated outputs of the PCS 1 and 2 (E1 + E2) = 8 [kW]. Therefore, in order to suppress the reverse conversion power Wb in preference to the conversion power Wc, the conversion control value Y is maintained, and the reverse conversion control value Xb is the reverse conversion control value Xb, which is the power consumption WL and the conversion power Wc of the power generation PCS2. It is reduced according to the difference. Therefore, in the time zone T6, the inverse conversion control value Xb decreases from 100 [%] toward 25 [%] according to the difference. Further, the conversion control value Y is maintained at 100% until the inverse conversion control value Xb reaches 25 [%]. Accordingly, the reverse conversion upper limit value of the integrated PCS 1 is reduced from 4 [kW], the conversion upper limit value of the power generation PCS 2 is maintained at 4 [kW], and the allowable upper limit value WU of the actually allowed output power WT is 8 Reduce from [kW].

  According to the present embodiment described above, the power management device 3 manages the first power control device 1 and the second power control device 2 that can be interconnected with the power system CS based on the output control information. 365, the first power control device 1 is connected between the energization path P connected to the power grid CS, the first power generation device PV1 and the power storage device S, and the second power control device 2 is connected to the energization path P. A second power Wc connected between the second power generation device PV2 and converted from the second generated power W2 of the second power generation device PV2 is output to the energization path P. The output control information includes the first power control device. An output control period for controlling the output power WT output from the first and second power control devices 2 to the energization path P is set, and in the output control period, the management unit 365 outputs from the first power control apparatus 1 to the energization path P. The first power Wb to be used is the second power control device 2 It is configured to suppress in priority to the second power Wc output to current path P.

  According to this configuration, the first power control device 1 outputs the first power W1 to at least one of the energization path P and the power storage device S, and the second power generator 2 outputs the second power Wb to the energization path P. . In the output control period in which the output power WT is controlled, the first power Wb is suppressed with priority over the second power Wc. Therefore, in the first power conversion device 1, the power WS output to the power storage device S in the first generated power W1 can be supplied to the power storage device S and charged in the output control period. Moreover, since the 1st electric power Wb is suppressed with priority over the 2nd electric power Wc, in the 2nd power converter device 2, compared with the case where the 1st electric power Wb and the 2nd electric power Wc are suppressed equally, for example. The suppression of the second power can be reduced. Therefore, the generated power W1 and W2 in the output control period can be effectively used without waste.

  In addition, according to the present embodiment, the power monitoring unit 362 that monitors the power receiving point power Wr that flows through the power receiving point based on the detection result of the power detector M provided at the power receiving point on the energization path P is further provided and output. In the control period, the receiving point power Wr does not flow backward to the power system CS, and the power consumption WL of the power load L connected to the energization path P is the upper limit of the output power WT allowed in the output control period. If smaller, the management unit 365 is configured to suppress the first power Wb with priority over the second power Wc.

  According to this configuration, when the power is not sold to the power grid CS, the receiving power Wr that is purchased from the power grid CS in a state where the first power Wb is suppressed with priority over the second power Wc. (> 0) can be set to zero.

  Further, according to the present embodiment, the power management device 3 calculates the first control value Xb indicating the upper limit of the first power Wb and the second control value Y indicating the upper limit of the second power Wc in the output control period. The output control information further includes an output control value α indicating an upper limit in one output control period of the first power Wb, the second power Wc, and the output power WT, and the calculation unit 363. Calculates the first control value Xb and the second control value Y based on the output control value α, and the management unit 365 calculates the first power control device 1 and the first control value in the output control period based on the result calculated by the calculation unit 363. 2 The power control of the power control device 2 is managed. In this configuration, the calculation unit 363 further includes the first control value Xb and the second control value based on the first rated power E1 of the first power control device 1 and the second rated power E2 of the second power control device 2. Y may be calculated. Alternatively, as will be described later, the calculation unit 363 further performs the first control value Xb and the second control based on at least one of the maximum value W1max of the first generated power W1 and the maximum value W2max of the second generated power W2. The value Y may be calculated.

  According to this configuration, the first control value Xb and the second control value Y can be calculated based on the output control value α and the like. And based on these calculation results, the power control of the first power control device 1 and the second power control device 2 in the output control period can be managed.

  Further, according to the present embodiment, the first control value Xb is normally set to be equal to or less than the second control value Y.

  According to this configuration, the first control value Xb and the second control value Y can be set to values at which the first power Wb is suppressed with priority over the second power Wc.

  Further, according to the present embodiment, in the power management device 3, the receiving point power Wr does not flow backward to the power system CS in the output control period, and the power consumption WL is allowed in the output control period. If the calculation unit 363 can calculate the second control value Y at which the power receiving point power Wr is 0 when the output power WT is lower than the upper limit, the management unit 365 uses the first control value Xb as the output control value α. Is set to the same value as.

  According to this configuration, when the receiving point power can be reduced to 0 by adjusting the second control value Y, the first control value Xb is set to the same value as the output control value α, and the first power Wb is set to the second power Wc. Can be suppressed with higher priority.

  Further, according to the present embodiment, in the power management device 3, the receiving point power Wr does not flow backward to the power system CS in the output control period, and the power consumption WL is allowed in the output control period. If the second control value Y at which the power receiving point power Wr is 0 cannot be calculated by the calculation unit 363 when the output power WT is lower than the upper limit, the second control value Y is set to the maximum of the second control value Y. A value (for example, Y = 100 [%]) is set to calculate the first control value Xb at which the power receiving point power Wr becomes zero.

  According to this configuration, when the receiving point power cannot be reduced to 0 by adjusting the second control value Y, the second control value Y is set to the maximum value, and the first control value is set to a value at which the receiving point power becomes 0. Adjust Xb. With these settings, the first power Wb can be suppressed with priority over the second power Wc.

Second Embodiment
Next, a second embodiment will be described. In the second embodiment, the controller 3 is provided integrally with the integrated PCS 1. Hereinafter, a configuration different from the first embodiment will be described. Moreover, the same code | symbol is attached | subjected to the structure part similar to 1st Embodiment, and the description may be abbreviate | omitted.

  FIG. 10 is a block diagram illustrating another configuration example of the solar power generation system 100. In the photovoltaic power generation system 100 of FIG. 10, the integrated PCS 1 incorporates a controller 3, and includes a DC / DC converter 11, a bidirectional inverter 12, a smoothing capacitor 13, a bidirectional DC / DC converter 14, A display unit 31, an input unit 32, a communication unit 33, a communication I / F 34, a storage unit 35, and a CPU 36 are provided. The DC / DC converter 11, the bidirectional inverter 12, and the bidirectional DC / DC converter 14 are controlled by the CPU 36, respectively. The display unit 31, the input unit 32, the communication unit 33, the communication I / F 34, the storage unit 35, and the CPU 36 constitute a power management apparatus that controls and manages the integrated PCS1 and the power generation PCS2.

  In the present embodiment, the controller 3 is built in the integrated PCS 1. However, the controller 3 is not limited to this example, and the controller 3 may be built in the power generation PCS 2.

  According to this embodiment described above, the power management device 3 is configured to be provided integrally with one of the first power control device 1 and the second power control device 2.

  According to this configuration, one of the first power control device 1 and the second power control device 2 and the power management device 3 may not be provided separately. Therefore, the configuration of the power system 100 can be simplified.

<Third Embodiment>
Next, a third embodiment will be described. In the third embodiment, the distributed power source performs power generation using renewable energy other than sunlight (natural energy power generation such as wind, hydropower, geothermal, biomass, solar heat, waste power generation, etc.). Hereinafter, a configuration different from the first and second embodiments will be described. Moreover, the same code | symbol is attached | subjected to the component similar to 1st and 2nd embodiment, and the description may be abbreviate | omitted.

  Here, a wind power generation system 101 will be described as an example of a power generation system using renewable energy. The wind power generation system 101 is a distributed power source that supplies power by a power generation method using wind power.

  FIG. 11 is a block diagram illustrating a configuration example of the wind power generation system 101. As shown in FIG. 11, the wind power generation system 101 includes a wind power generation device AG. The wind power generator AG includes a first wind power generator AG1 and a second wind power generator AG2. Each of the wind turbine generators AG1 and AG2 includes, for example, a horizontal axis propeller type windmill (not shown) and a generator (not shown) driven by the rotation of the windmill. When the windmill blade receives wind, the windmill rotates. The rotational force is transmitted to the generator, and AC power is output from the generator as generated power. The first wind power generator AG1 is connected to the AD / DC converter 18 of the integrated PCS1, and the second wind power generator AG2 is connected to the AD / DC converter 28 of the power generation PCS2.

  The integrated PCS 1 includes an AC / DC converter 18 in addition to the bidirectional inverter 12, the smoothing capacitor 13, the bidirectional DC / DC converter 14, the communication unit 15, the memory 16, and the IC 17. The AC / DC converter 18, the bidirectional inverter 12, and the bidirectional DC / DC converter 14 are connected to each other via a bus line BL. The AC / DC converter 18 is provided between the first wind power generator AG1 and the bus line BL, converts AC generated power generated by the first wind power generator AG1 into DC power, and outputs the DC power to the bus line BL. The AC / DC converter 18 also functions as a backflow prevention device that prevents a reverse current from flowing through the first wind power generator AG1.

  The power generation PCS 2 includes an AC / DC converter 28 in addition to the inverter 22, the communication unit 25, the memory 26, and the IC 27. The AC / DC converter 28 is provided between the second wind power generator AG2 and the inverter 22, and converts AC generated power generated by the second wind power generator AG2 into DC power and outputs it to the inverter 22. The AC / DC converter 28 also functions as a backflow prevention device that prevents reverse current from flowing through the second wind power generator AG2.

  The embodiment of the present invention has been described above. The above-described embodiment is an exemplification, and various modifications can be made to the combination of each component and each process, and it will be understood by those skilled in the art that it is within the scope of the present invention.

  For example, in the first to third embodiments described above, the output control value α, the inverse conversion control value Xb, and the conversion control value Y are specified for the rated powers E1 and E2 of the PCS 1 and 2, respectively. The invention is not limited to these examples. The output control value α may be specified, for example, for the sum of the rated powers of the PCS 1 and 2 (E1 + E2), or the power generation capacities of the solar cell strings PV1 and PV2 (that is, the maximum value of the generated power W1 and W2 W1max, W2max) may be specified, or may be specified for the sum of the power generation capacities (W1max + W2max). When the output control value α is specified for the total sum of the rated power (E1 + E2), the inverse conversion control value Xb and the conversion control value Y are upper limit values that allow the output power WT to be based on the output control value α. Each value is set so as not to exceed α (E1 + E2) / 100. When the output control value α is specified for at least one of the power generation capacities of the solar cell strings PV1, PV2, for example, the reverse conversion control value Xb is the upper limit value αW1max based on the reverse control power Wb based on the output control value α. The conversion control value Y is set to a value that does not exceed the upper limit value αW2max / 100 based on the output control value α. Alternatively, the inverse conversion control value Xb and the conversion control value Y are both set to values that the inverse conversion power Wb and the conversion power Wc do not exceed one of the upper limit values αW1max / 100 and αW2max / 100 based on the output control value α. May be. When the output control value α is specified for the total power generation capacity (W1max + W2max), the reverse conversion control value Xb and the conversion control value Y are the power generation capacity in which the output power WT is allowed based on the output control value α. Are set to values that do not exceed the upper limit value α (W1max + W2max) / 100 with respect to the sum (W1max + W2max).

  In the first to third embodiments described above, at least some or all of the functions of the IC 17, the function of the IC 27, and the functional components 361 to 365 of the CPU 36 are physical components (for example, electric circuits). , Elements, devices, etc.).

100 Solar Power Generation System 101 Wind Power Generation System 1 Integrated PCS (Composite Power Conditioner)
11 DC / DC converter 12 Bidirectional inverter 13 Smoothing capacitor 14 Bidirectional DC / DC converter 15 Communication unit 16 Memory 17 IC
18 AC / DC converter 2 PCS for power generation (Power conditioner for power generation)
21 DC / DC converter 22 Inverter 25 Communication unit 26 Memory 27 IC
28 AC / DC converter 3 Controller 31 Display unit 32 Input unit 33 Communication unit 34 Communication I / F
35 Memory 36 CPU
361 Information acquisition unit 362 Power monitoring unit 363 Calculation unit 364 Timer 365 Management unit CS Commercial power system L Power load NT network M Wattmeter BL Bus line PV Solar cell string PV1 First solar cell string PV2 Second solar cell string AG Wind power Power generation device AG1 First wind power generation device AG2 Second wind power generation device S Power storage device P Current path

Claims (5)

A management unit that manages the first power control device and the second power control device that can be interconnected with the power system based on the output control information,
The first power control device is connected between the energization path connected to the power system, the first power generation device and the power storage device, and the second power control device is between the energization path and the second power generation device. Connected to
In the output control information, an output control period for controlling output power output from the first power control device and the second power control device to the energization path is set.
In the output control period, the management unit prioritizes the first power output from the first power control device to the power supply path over the second power output from the second power control device to the power supply path. Power management device to be suppressed. A power monitoring unit that monitors power reception point power flowing through the power reception point based on a detection result of a power detector provided at the power reception point on the energization path;
In the output control period, the power at the receiving point is not reversely flowing to the power system, and the power consumption of the power load connected to the power supply path is allowed in the output control period. The power management apparatus according to claim 1, wherein, when smaller than an upper limit, the management unit suppresses the first power in preference to the second power. A calculation unit for calculating a first control value indicating an upper limit of the first power in the output control period and a second control value indicating an upper limit of the second power;
In the output control information, an output control value indicating an upper limit in the output control period of one of the first power, the second power, and the output power is set,
The calculation unit calculates the first control value and the second control value based on the output control value,
The power management device according to claim 2, wherein the management unit manages the power control of the first power control device and the second power control device in the output control period based on a result calculated by the calculation unit.   In the output control period, when the receiving point power does not flow backward to the power system, and the power consumption is smaller than the upper limit of the output power allowed in the output control period, the calculation unit 4. The power management according to claim 3, wherein if the second control value at which the power at the receiving point is 0 can be calculated, the management unit sets the first control value to the same value as the output control value. apparatus.   In the output control period, the calculation is performed when the receiving point power does not flow backward to the power system and the power consumption is smaller than the upper limit of the output power allowed in the output control period. If the second control value at which the power receiving point power is 0 cannot be calculated by the unit, the second control value is set to the maximum value of the second control value, and the power receiving point power becomes 0. The power management apparatus according to claim 3 or 4, wherein the first control value is calculated.

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